摘要
以静电纺丝聚偏氟乙烯(PVDF)纳米纤维膜为多孔支撑层,在其上涂覆聚二甲基硅氧烷(PDMS)为致密分离层,制备了PVDF/PDMS复合纳米纤维膜,并对复合膜的渗透汽化脱盐性能进行了研究。在涂覆操作前,使用堵孔剂聚乙二醇处理PVDF纳米纤维膜,以降低涂覆过程的孔渗问题,有效提高了复合膜对盐离子的截留能力。通过扫描电子显微镜、热重分析仪和红外光谱仪等手段表征了复合膜的微观形貌、热稳定性和表面官能团形式。结果表明:聚乙二醇浓度为12%(wt,质量分数,下同)为最佳处理条件。操作温度为25℃时,渗透汽化脱盐通量可达6.46L/(m^2·h),NaCl截留率为98.8%;升温至75℃,通量可达19.3L/(m2·h),NaCl截留率为95.6%。
Polydimethylsiloxane/polyvinydenefluoride(PDMS/PVDF)composite nanofibrous membranes were prepared by coating electrospinning PVDF nanofibers with PDMS solution for pervaporation separation of NaCl aqueous solution.Filling the pores of PVDF layer with polyethylene glycol(PEG)before the coating process alleviated the permeability of PDMS and enhanced rejection rate of NaCl by protecting the pores from blocking of PDMS.The morphology and functional groups of membranes were characterized and the results suggested that permeation flux of membranes reached 6.46 L/(m^2·h)with the rejection of 98.8%,when PEG blocking solution concentration was 12%.With the operating temperature increased to 75℃,the permeation flux of membranes heightened to 19.3 L/(m^2·h)and the rejection rate of NaCl maintained at 95.6%.
作者
刘秋波
汪滨
王娇娜
李从举
李秀艳
Liu Qiubo;Wang Bin;Wang Jiaona;Li Congju;Li Xiuyan(College of Material Science and Engineering,Beijing Institute of Fashion Technology, Beijing 100029;Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing 100029;School of Energy and Environmental Engineering,University of Science and Technology,Beijing 100083)
出处
《化工新型材料》
CAS
CSCD
北大核心
2019年第1期139-143,共5页
New Chemical Materials
基金
国家自然科学基金(51503005和21274006)
北京市科技北京百名领军人才工程(Z161100004916168)
北京市百千万人才工程(110403000402)
北京市自然科学基金(2182014)
北京市优秀人才青年骨干个人项目(2017000020124G089)
北京市教育委员会科技计划一般项目(SQKM201710012004)
"北京服装学院高水平教师队伍建设专项资金"(BIFTQG201807)
关键词
静电纺丝
聚偏氟乙烯
聚二甲基硅氧烷
渗透汽化
electrospinning
polyvinydenefluoride (PVDF)
polydimethylsiloxane (PDMS)
pervaporation
